Shaft extractor



Dec. 20, 1932. A. cox

SHAFT EXTRACTOR Filed May 19, 1951 2 Sheets-Sheet 1 4 W 2 ng m 9 Dec. 20, 1932.

Patented Dec. 20, 1932 UNITED STATES PATENT OFFICE ALLEN COX, AMES, IOWA, ASSIGNOR OF ONE-HALF TO F. E. BROWN, OF AMES, IOWA SHAFT EXTRAGTOR Application filed May 19, 1931.

This invention relates to improvements in shaft extractors, and more particularly to an apparatus for extracting a shaft from a 7 wheel or a pulley.

One of the objects of the invention is to provide an apparatus for this purpose of simple and inexpensive construction, and involving tong arms; one end of each arm being flexibly connected to a combined assembly which distributes, guides and locks the arms in position.

Another object is to furnish a device of this character, in which the tong arms are detachably connected to said assembly, and in which the latter can accommodate two or more arms or sets of arms of different lengths which may be so placed on the assembly as to accommodate various types of wheels or pulleys.

A still further object is to provide a shaft extractor including a screw provided at its lower end with a removable tip which may be screwed on the lower end of the screw. By employing tips of various sizes, it makes it possible to extract shafts of different diameters.

With the foregoing objects outlined and with other objects in view which will appear as the description proceeds, the invention consists in the novel features hereinafter described in detail, illustrated in the accompanying drawings, and more particularly pointed out in the appended claims.

In the drawings,

Fig. 1 is an elevation of the device, including three tong arms.

Fig. 2 is a view half in elevation and half in vertical section, of the screw which forms an element of the assembly that distributes, guides and locks the arms in position.

Fig. 3 is a vertical sectional view of the nut forming part of said assembly.

Fig. 4 is a View half in elevation and half in vertical section, of the spacing member of said assembly.

Fig. 5 is a top plan view of said spacer.

Fig. 6 is an elevation of one of the tong arms detached from the apparatus.

Fig. 7 is an elevation of one of the removable tips forming part of the device.

Serial No. 538,539.

Fig. 8 is an edge view of the head of one of the tong arms.

Referring to the drawings, 8 designates the axially movable and rotatable screw of the device which has one of its ends provided with a square head 9 that may be turned by any suitable tool or handle, and may be struck with a hammer when necessary for moving the same axially. The threads extend to the lower end of the screw as shown at 10 to accommodate tips 11 of various sizes that are internally threaded to permit them to be screwed on and off the main screw 8. A tip of one size, is shown in Fig. 1, and a tip of a different size, is illustrated in Fig. 7 The main screw engages the internal threads of a member 12 which is provided at its lower endwith an annular shelf 13, the upper surface of which forms an annular trough 14 of curved cross section. A neck 15 projects upwardly from the shelf and is provided with external screw threads 16.

g The device illustrated can accommodate from two to six tong arms 17, each of which has a hook-shaped lower end 18, and a curved head 19, and the arms of different sets may be of varying lengths. The under surface of said head conforms to the curved surface of the trough 14, so that each arm will rock in the trough. These arms are held in spaced relation by means of a hollow cap 20, which is provided on its under side with notches 22 to receive the heads 19. Each notch terminates at its upper end in a horizontal surface 23 which abuts against a straight surface 24 of the head 19, and it will be understood that when cap is forced downwardly, it will tend to rock the tong arms and to draw their hook ends toward one another. Such depression of the cap is brought about by a nut 25 that engages the threads 16. Bosses 19 which project from opposite sides of each head 19 cooperate with the cap to prevent the head. from leaving its notch 22.

In operation, the proper number of tong arms will be attached to the shelf and cap assembly by raising the nut 25 and moving the cap away from the shelf a suflicient distance to allow for the insertion of the heads 19 of the arms into the notches 22 and trough 14. Then the hooked ends of the arms are brought into engagement with the hub or periphery of the wheel or pulley, and the nut 25 is tightened. Now, by screwing downwardly the screw 8, its lower end (if a tip 11 is not used) pushes the shaft in one direction while the arms 17 are pulling the wheel or pulley in the opposite direction. In case the pulley and shaft should resist turning of the screw 8, the head of the latter may be struck a sharp blow so as to loosen the shaft from the pulley, and then turning of the screw 8 will cause extraction of the shaft.

WVhile I have disclosed what I now consider to be a preferred embodimentof the invention in such manner that the same may be readily understood by those skilled in the art, I am aware that changes may be made in the details disclosed without departing from the spirit of the invention, asexpressed in the claims.

What I claim and desire to secure by Letters Patent is:

1. A shaft extractor comprising an assembly, tong arms detachablyconnected to said assembly, the arms being turnably connected to said assembly and the latterwfunctioning to distribute, guide and lock the arms against angular movement while in position, said assembly including a'cap having notches into which the heads of the arms extend.

27A shaft extractor comprisingan assembly, tong arms detachably connected to said assembly, the arms being turnably connected to said assembly and the latter functioning v to distribute, guide and lock the arms'against angular movement while in position, said assembly including a vertically movable cap having radial notches on its under side into which the heads of the arms extend.

3. A shaft extractor comprising an axially movable and rotatablescrew having a head at one end and a tip at its opposite end, a shelf member having an upwardly extending neck threaded on said screw, the shelf having a substantially annular trough in its upper surface encircling said neck, a cap loosely mounted on the neck and having radial notches in its under side, a nut threaded on to said neck and adapted to'force the cap toward the shelf, and tong arms detachably connected to said shelf and having curved heads extending into said notches and trough.

In testimony whereof, I have signed this specification.

ALLEN COX. 

